/**
* Custom PHP profiler for parser/DB type section names that xhprof/xdebug can't handle
*
- * @TODO: refactor implementation by moving Profiler code to here when non-automatic
- * profiler support is dropped.
- *
* @since 1.25
*/
class SectionProfiler {
- /** @var ProfilerStandard */
- protected $profiler;
+ /** @var array List of resolved profile calls with start/end data */
+ protected $stack = array();
+ /** @var array Queue of open profile calls with start data */
+ protected $workStack = array();
+
+ /** @var array Map of (function name => aggregate data array) */
+ protected $collated = array();
+ /** @var bool */
+ protected $collateDone = false;
+ /** @var bool Whether to collect the full stack trace or just aggregates */
+ protected $collateOnly = true;
- public function __construct() {
- // This does *not* care about PHP request start time
- $this->profiler = new ProfilerStandard( array( 'initTotal' => false ) );
+ /** @var array Cache of a standard broken collation entry */
+ protected $errorEntry;
+
+ /**
+ * @param array $params
+ */
+ public function __construct( array $params = array() ) {
+ $this->errorEntry = $this->getErrorEntry();
+ $this->collateOnly = empty( $params['trace'] );
}
/**
* @return ScopedCallback
*/
public function scopedProfileIn( $section ) {
- $profiler = $this->profiler;
- $sc = new ScopedCallback( function() use ( $profiler, $section ) {
- $profiler->profileOut( $section );
- } );
- $profiler->profileIn( $section );
+ $this->profileInInternal( $section );
- return $sc;
+ $that = $this;
+ return new ScopedCallback( function() use ( $that, $section ) {
+ $that->profileOutInternal( $section );
+ } );
}
/**
* - %memory : percent memory used
*/
public function getFunctionStats() {
- $data = $this->profiler->getFunctionStats();
+ $this->collateData();
- $cpuTotal = 0;
- $memoryTotal = 0;
- $elapsedTotal = 0;
- foreach ( $data as $item ) {
- $memoryTotal += $item['memory'];
- $elapsedTotal += $item['real'];
- $cpuTotal += $item['cpu'];
+ $totalCpu = 0.0;
+ $totalReal = 0.0;
+ $totalMem = 0;
+ foreach ( $this->collated as $fname => $data ) {
+ $totalCpu += $data['cpu'];
+ $totalReal += $data['real'];
+ $totalMem += $data['memory'];
}
- foreach ( $data as &$item ) {
- $item['%cpu'] = $item['cpu'] ? $item['cpu'] / $cpuTotal * 100 : 0;
- $item['%real'] = $elapsedTotal ? $item['real'] / $elapsedTotal * 100 : 0;
- $item['%memory'] = $item['memory'] ? $item['memory'] / $memoryTotal * 100 : 0;
+ $profile = array();
+ foreach ( $this->collated as $fname => $data ) {
+ $profile[] = array(
+ 'name' => $fname,
+ 'calls' => $data['count'],
+ 'real' => $data['real'] * 1000,
+ '%real' => $totalReal ? 100 * $data['real'] / $totalReal : 0,
+ 'cpu' => $data['cpu'] * 1000,
+ '%cpu' => $totalCpu ? 100 * $data['cpu'] / $totalCpu : 0,
+ 'memory' => $data['memory'],
+ '%memory' => $totalMem ? 100 * $data['memory'] / $totalMem : 0,
+ );
}
- unset( $item );
- $data[] = array(
+ $profile[] = array(
'name' => '-total',
'calls' => 1,
- 'real' => $elapsedTotal,
+ 'real' => 1000 * $totalReal,
'%real' => 100,
- 'memory' => $memoryTotal,
+ 'cpu' => 1000 * $totalCpu,
+ '%cpu' => 100,
+ 'memory' => $totalMem,
'%memory' => 100,
);
- return $data;
+ return $profile;
+ }
+
+ /**
+ * @return array Initial collation entry
+ */
+ protected function getZeroEntry() {
+ return array(
+ 'cpu' => 0.0,
+ 'real' => 0.0,
+ 'memory' => 0,
+ 'count' => 0
+ );
+ }
+
+ /**
+ * @return array Initial collation entry for errors
+ */
+ protected function getErrorEntry() {
+ $entry = $this->getZeroEntry();
+ $entry['count'] = 1;
+ return $entry;
+ }
+
+ /**
+ * Update the collation entry for a given method name
+ *
+ * @param string $name
+ * @param float $elapsedCpu
+ * @param float $elapsedReal
+ * @param int $memChange
+ */
+ protected function updateEntry( $name, $elapsedCpu, $elapsedReal, $memChange ) {
+ $entry =& $this->collated[$name];
+ if ( !is_array( $entry ) ) {
+ $entry = $this->getZeroEntry();
+ $this->collated[$name] =& $entry;
+ }
+ $entry['cpu'] += $elapsedCpu;
+ $entry['real'] += $elapsedReal;
+ $entry['memory'] += $memChange > 0 ? $memChange : 0;
+ $entry['count']++;
+ }
+
+ /**
+ * This method should not be called outside SectionProfiler
+ *
+ * @param string $functionname
+ */
+ public function profileInInternal( $functionname ) {
+ $this->workStack[] = array(
+ $functionname,
+ count( $this->workStack ),
+ $this->getTime( 'time' ),
+ $this->getTime( 'cpu' ),
+ memory_get_usage()
+ );
+ }
+
+ /**
+ * This method should not be called outside SectionProfiler
+ *
+ * @param string $functionname
+ */
+ public function profileOutInternal( $functionname ) {
+ $item = array_pop( $this->workStack );
+ if ( $item === null ) {
+ $this->debugGroup( 'profileerror', "Profiling error: $functionname" );
+ return;
+ }
+ list( $ofname, /* $ocount */, $ortime, $octime, $omem ) = $item;
+
+ if ( $functionname === 'close' ) {
+ $message = "Profile section ended by close(): {$ofname}";
+ $this->debugGroup( 'profileerror', $message );
+ if ( $this->collateOnly ) {
+ $this->collated[$message] = $this->errorEntry;
+ } else {
+ $this->stack[] = array( $message, 0, 0.0, 0.0, 0, 0.0, 0.0, 0 );
+ }
+ $functionname = $ofname;
+ } elseif ( $ofname !== $functionname ) {
+ $message = "Profiling error: in({$ofname}), out($functionname)";
+ $this->debugGroup( 'profileerror', $message );
+ if ( $this->collateOnly ) {
+ $this->collated[$message] = $this->errorEntry;
+ } else {
+ $this->stack[] = array( $message, 0, 0.0, 0.0, 0, 0.0, 0.0, 0 );
+ }
+ }
+ $realTime = $this->getTime( 'wall' );
+ $cpuTime = $this->getTime( 'cpu' );
+ if ( $this->collateOnly ) {
+ $elapsedcpu = $cpuTime - $octime;
+ $elapsedreal = $realTime - $ortime;
+ $memchange = memory_get_usage() - $omem;
+ $this->updateEntry( $functionname, $elapsedcpu, $elapsedreal, $memchange );
+ } else {
+ $this->stack[] = array_merge( $item,
+ array( $realTime, $cpuTime, memory_get_usage() ) );
+ }
+ }
+
+ /**
+ * Returns a tree of function calls with their real times
+ * @return string
+ */
+ public function getCallTreeReport() {
+ if ( $this->collateOnly ) {
+ throw new Exception( "Tree is only available for trace profiling." );
+ }
+ return implode( '', array_map(
+ array( $this, 'getCallTreeLine' ), $this->remapCallTree( $this->stack )
+ ) );
+ }
+
+ /**
+ * Recursive function the format the current profiling array into a tree
+ *
+ * @param array $stack Profiling array
+ * @return array
+ */
+ protected function remapCallTree( array $stack ) {
+ if ( count( $stack ) < 2 ) {
+ return $stack;
+ }
+ $outputs = array();
+ for ( $max = count( $stack ) - 1; $max > 0; ) {
+ /* Find all items under this entry */
+ $level = $stack[$max][1];
+ $working = array();
+ for ( $i = $max -1; $i >= 0; $i-- ) {
+ if ( $stack[$i][1] > $level ) {
+ $working[] = $stack[$i];
+ } else {
+ break;
+ }
+ }
+ $working = $this->remapCallTree( array_reverse( $working ) );
+ $output = array();
+ foreach ( $working as $item ) {
+ array_push( $output, $item );
+ }
+ array_unshift( $output, $stack[$max] );
+ $max = $i;
+
+ array_unshift( $outputs, $output );
+ }
+ $final = array();
+ foreach ( $outputs as $output ) {
+ foreach ( $output as $item ) {
+ $final[] = $item;
+ }
+ }
+ return $final;
+ }
+
+ /**
+ * Callback to get a formatted line for the call tree
+ * @param array $entry
+ * @return string
+ */
+ protected function getCallTreeLine( $entry ) {
+ // $entry has (name, level, stime, scpu, smem, etime, ecpu, emem)
+ list( $fname, $level, $startreal, , , $endreal ) = $entry;
+ $delta = $endreal - $startreal;
+ $space = str_repeat( ' ', $level );
+ # The ugly double sprintf is to work around a PHP bug,
+ # which has been fixed in recent releases.
+ return sprintf( "%10s %s %s\n",
+ trim( sprintf( "%7.3f", $delta * 1000.0 ) ), $space, $fname );
+ }
+
+ /**
+ * Populate collated data
+ */
+ protected function collateData() {
+ if ( $this->collateDone ) {
+ return;
+ }
+ $this->collateDone = true;
+ // Close opened profiling sections
+ while ( count( $this->workStack ) ) {
+ $this->profileOutInternal( 'close' );
+ }
+
+ if ( $this->collateOnly ) {
+ return; // already collated as methods exited
+ }
+
+ $this->collated = array();
+
+ # Estimate profiling overhead
+ $profileCount = count( $this->stack );
+ $this->calculateOverhead( $profileCount );
+
+ # First, subtract the overhead!
+ $overheadTotal = $overheadMemory = $overheadInternal = array();
+ foreach ( $this->stack as $entry ) {
+ // $entry is (name,pos,rtime0,cputime0,mem0,rtime1,cputime1,mem1)
+ $fname = $entry[0];
+ $elapsed = $entry[5] - $entry[2];
+ $memchange = $entry[7] - $entry[4];
+
+ if ( $fname === '-overhead-total' ) {
+ $overheadTotal[] = $elapsed;
+ $overheadMemory[] = max( 0, $memchange );
+ } elseif ( $fname === '-overhead-internal' ) {
+ $overheadInternal[] = $elapsed;
+ }
+ }
+ $overheadTotal = $overheadTotal ?
+ array_sum( $overheadTotal ) / count( $overheadInternal ) : 0;
+ $overheadMemory = $overheadMemory ?
+ array_sum( $overheadMemory ) / count( $overheadInternal ) : 0;
+ $overheadInternal = $overheadInternal ?
+ array_sum( $overheadInternal ) / count( $overheadInternal ) : 0;
+
+ # Collate
+ foreach ( $this->stack as $index => $entry ) {
+ // $entry is (name,pos,rtime0,cputime0,mem0,rtime1,cputime1,mem1)
+ $fname = $entry[0];
+ $elapsedCpu = $entry[6] - $entry[3];
+ $elapsedReal = $entry[5] - $entry[2];
+ $memchange = $entry[7] - $entry[4];
+ $subcalls = $this->calltreeCount( $this->stack, $index );
+
+ if ( substr( $fname, 0, 9 ) !== '-overhead' ) {
+ # Adjust for profiling overhead (except special values with elapsed=0
+ if ( $elapsed ) {
+ $elapsed -= $overheadInternal;
+ $elapsed -= ( $subcalls * $overheadTotal );
+ $memchange -= ( $subcalls * $overheadMemory );
+ }
+ }
+
+ $this->updateEntry( $fname, $elapsedCpu, $elapsedReal, $memchange );
+ }
+
+ $this->collated['-overhead-total']['count'] = $profileCount;
+ arsort( $this->collated, SORT_NUMERIC );
+ }
+
+ /**
+ * Dummy calls to calculate profiling overhead
+ *
+ * @param int $profileCount
+ */
+ protected function calculateOverhead( $profileCount ) {
+ $this->profileInInternal( '-overhead-total' );
+ for ( $i = 0; $i < $profileCount; $i++ ) {
+ $this->profileInInternal( '-overhead-internal' );
+ $this->profileOutInternal( '-overhead-internal' );
+ }
+ $this->profileOutInternal( '-overhead-total' );
+ }
+
+ /**
+ * Counts the number of profiled function calls sitting under
+ * the given point in the call graph. Not the most efficient algo.
+ *
+ * @param array $stack
+ * @param int $start
+ * @return int
+ */
+ protected function calltreeCount( $stack, $start ) {
+ $level = $stack[$start][1];
+ $count = 0;
+ for ( $i = $start -1; $i >= 0 && $stack[$i][1] > $level; $i-- ) {
+ $count ++;
+ }
+ return $count;
+ }
+
+ /**
+ * Get the initial time of the request, based either on $wgRequestTime or
+ * $wgRUstart. Will return null if not able to find data.
+ *
+ * @param string|bool $metric Metric to use, with the following possibilities:
+ * - user: User CPU time (without system calls)
+ * - cpu: Total CPU time (user and system calls)
+ * - wall (or any other string): elapsed time
+ * - false (default): will fall back to default metric
+ * @return float|null
+ */
+ protected function getTime( $metric = 'wall' ) {
+ if ( $metric === 'cpu' || $metric === 'user' ) {
+ $ru = wfGetRusage();
+ if ( !$ru ) {
+ return 0;
+ }
+ $time = $ru['ru_utime.tv_sec'] + $ru['ru_utime.tv_usec'] / 1e6;
+ if ( $metric === 'cpu' ) {
+ # This is the time of system calls, added to the user time
+ # it gives the total CPU time
+ $time += $ru['ru_stime.tv_sec'] + $ru['ru_stime.tv_usec'] / 1e6;
+ }
+ return $time;
+ } else {
+ return microtime( true );
+ }
+ }
+
+ /**
+ * Add an entry in the debug log file
+ *
+ * @param string $s String to output
+ */
+ protected function debug( $s ) {
+ if ( function_exists( 'wfDebug' ) ) {
+ wfDebug( $s );
+ }
+ }
+
+ /**
+ * Add an entry in the debug log group
+ *
+ * @param string $group Group to send the message to
+ * @param string $s String to output
+ */
+ protected function debugGroup( $group, $s ) {
+ if ( function_exists( 'wfDebugLog' ) ) {
+ wfDebugLog( $group, $s );
+ }
}
}
dépôts / lhc / web / wiklou.git / commitdiff